REST API是什麼？完整設計指南：核心原則、最佳實務與實際應用

// 文章相關 API 實作
const express = require('express');
const router = express.Router();

// 取得所有文章
router.get('/posts', async (req, res) => {
  try {
    const { page = 1, limit = 10, author, status } = req.query;
    
    const query = {};
    if (author) query.author = author;
    if (status) query.status = status;
    
    const posts = await Post.find(query)
      .limit(limit * 1)
      .skip((page - 1) * limit)
      .populate('author', 'name email');
    
    const total = await Post.countDocuments(query);
    
    res.json({
      data: posts,
      pagination: {
        current_page: parseInt(page),
        total_pages: Math.ceil(total / limit),
        total_items: total
      }
    });
  } catch (error) {
    res.status(500).json({
      error: {
        code: 'SERVER_ERROR',
        message: '取得文章列表失敗'
      }
    });
  }
});

// 建立新文章
router.post('/posts', authenticate, async (req, res) => {
  try {
    const { title, content, tags } = req.body;
    
    // 資料驗證
    if (!title || !content) {
      return res.status(400).json({
        error: {
          code: 'VALIDATION_ERROR',
          message: '標題和內容為必填欄位'
        }
      });
    }
    
    const post = new Post({
      title,
      content,
      tags,
      author: req.user.id
    });
    
    await post.save();
    
    res.status(201).json({
      data: post,
      message: '文章建立成功'
    });
  } catch (error) {
    res.status(500).json({
      error: {
        code: 'SERVER_ERROR',
        message: '建立文章失敗'
      }
    });
  }
});